<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->

      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader expand-trigger="hover" :options="catelist" :props="cateProps" v-model="addForm.goods_cat" @change="handleChange">
              </el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <!--上传图片-->
            <el-upload :action="uploadURL" 
            :on-preview="handlePreview" 
            :on-remove="handleRemove" 
            :on-success="handleSuccess" 
            list-type="picture" 
            :headers="headerObj">
              <el-button size="small" type="primary">点击上传</el-button>
              <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过500kb</div>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="addForm.goods_introduce"></quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>

    </el-card>
        <!-- 预览图片对话框 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
    <img :src="previewPath" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>

import _ from 'lodash'

export default {
  data() {
    return {
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        //图片的数组
        pics:[],
        //商品的详情介绍
       goods_introduce:'',
       //商品的参数数组，包含动态参数和静态属性
       attrs:[]
      },
      addFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 商品分类列表
      catelist: [],
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],

      //上传图片的后台API的地址
      uploadURL:' http://127.0.0.1:8888/api/private/v1/upload ',
      //图片上传组件的headers请求头对象
      headerObj: { Authorization: window.sessionStorage.getItem('token') },
      //保存预览图片的url地址
      previewPath: '',
      //控制预览图片对话框的显示和隐藏
      previewVisible:false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败！')
      }

      this.catelist = res.data
      console.log(this.catelist)
    },
    
    // 级联选择器选中项变化，会触发这个函数
    handleChange() {
      console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    
    beforeTabLeave(activeName, oldActiveName) {
      // console.log('即将离开的标签页名字是：' + oldActiveName)
      // console.log('即将进入的标签页名字是：' + activeName)
      // return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
   
    async tabClicked() {
      // console.log(this.activeIndex)
      // 证明访问的是动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'many' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数列表失败！')
        }

        console.log(res.data)
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: 'only' }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取静态属性失败！')
        }

        console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    
    //当用户点击图片进行预览时执行，处理图片预览
    handlePreview(file) {
    //形参file就是用户预览的那个文件
    this.previewPath = file.response.data.url
    //显示预览图片对话框
    this.previewVisible = true
  },
 
  handleRemove(file) {
    //当用户点击X号删除时执行
    //形参file就是用户点击删除的文件
    //获取用户点击删除的那个图片的临时路径
    const filePath = file.response.data.tmp_path
    //使用findIndex来查找符合条件的索引
    const index = this.addForm.pics.findIndex(item => item.pic === filePath)
    //移除索引对应的图片
    this.addForm.pics.splice(index, 1)
  },

  handleSuccess(response) {
    //当上传成功时触发执行
    //形参response就是上传成功之后服务器返回的结果
    //将服务器返回的临时路径保存到addForm表单的pics数组中
    const picInfo = { pic: response.data.tmp_path }
    this.addForm.pics.push(picInfo)
  }
  },

  add(){
  this.$refs.addFormRef.validate(async valid=>{
    if(!valid) return this.$message.error("请填写必要的表单项!")
    //将addForm进行深拷贝，避免goods_cat数组转换字符串之后导致级联选择器报错
    const form = _.cloneDeep(this.addForm)
    //将goods_cat从数组转换为"1,2,3"字符串形式
    form.goods_cat = form.goods_cat.join(",")
    //处理attrs数组，数组中需要包含商品的动态参数和静态属性
    //将manyTableData（动态参数）处理添加到attrs
    this.manyTableData.forEach(item=>{
      form.attrs.push({ attr_id:item.attr_id, attr_value:item.attr_vals.join(" ") }) 
    })
    //将onlyTableData（静态属性）处理添加到attrs
    this.onlyTableData.forEach(item=>{
      form.attrs.push({ attr_id:item.attr_id, attr_value:item.attr_vals }) 
    })
    //发送请求完成商品的添加,商品名称必须是唯一的
    const {data:res} = await this.$http.post('goods',form)
    if(res.meta.status !== 201){
      return this.$message.error('添加商品失败')
    }
    this.$message.success('添加商品成功')
    //编程式导航跳转到商品列表
    this.$router.push('/goods')
  })
},
  
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}

.btnAdd{
margin-top:15px;
}
</style>
